On Sun, 3 Jun 2018 18:04:23 +0300
Konstantin Belousov <kostik...@gmail.com> wrote:
> On Sun, Jun 03, 2018 at 04:55:00PM +0200, Michael Gmelin wrote:
> >
> >
> > On Sun, 3 Jun 2018 16:21:10 +0300
> > Konstantin Belousov <kostik...@gmail.com> wrote:
> >
> > > On Sun, Jun 03, 2018 at 02:48:40PM +0200, Michael Gmelin wrote:
> > > > Hi,
> > > >
> > > > After upgrading CURRENT to r333992 (from something at least a
> > > > year old, quite some changes in mp_machdep.c since), this
> > > > machine crashes on boot:
> > > >
> > > > Copyright (c) 1992-2018 The FreeBSD Project.
> > > > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992,
> > > > 1993, 1994 The Regents of the University of California. All
> > > > rights reserved. FreeBSD is a registered trademark of The
> > > > FreeBSD Foundation. FreeBSD 12.0-CURRENT #1 r333992: Tue May 22
> > > > 00:31:04 CEST 2018
> > > > root@flimsy:/usr/obj/usr/src/amd64.amd64/sys/flimsy amd64
> > > > FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565)
> > > > (based on LLVM 6.0.0) WARNING: WITNESS option enabled, expect
> > > > reduced performance. VT(vga): resolution 640x480 CPU: Intel(R)
> > > > Celeron(R) 2955U @ 1.40GHz (1396.80-MHz K8-class CPU)
> > > > Origin="GenuineIntel" Id=0x40651 Family=0x6 Model=0x45
> > > > Stepping=1
> > > > Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,
> > > > CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> > > > Features2=0x4ddaebbf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,SDBG,CX16,
> > > > xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,XSAVE,OSXSAVE,RDRAND>
> > > > AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM> AMD
> > > > Features2=0x21<LAHF,ABM> Structured Extended
> > > > Features=0x2603<FSGSBASE,TSCADJ,ERMS,INVPCID,NFPUSG> XSAVE
> > > > Features=0x1<XSAVEOPT> VT-x: (disabled in BIOS)
> > > > PAT,HLT,MTF,PAUSE,EPT,UG,VPID TSC: P-state invariant,
> > > > performance statistics real memory = 4301258752 (4102 MB)
> > > > avail memory = 1907572736 (1819 MB) Event timer "LAPIC" quality
> > > > 600 ACPI APIC Table: <CORE COREBOOT>
> > > What does this mean ? Did you flashed coreboot ?
> >
> > This machine comes with it by default (my model was delivered with
> > SeaBIOS 20131018_145217-build121-m2). So I didn't flash anything
> > (didn't feel like bricking it).
> >
> > >
> > > > kernel trap 12 with interrupts disabled
> > > >
> > > > Fatal trap 12: page fault while in kernel mode
> > > > cpuid = 0; apic id = 00
> > > > fault virtual address = 0xfffff80001000000
> > > > fault code = supervisor write data, protection
> > > > violation instruction pointer = 0x20:Oxffffffff8102955f
> > > > stack pointer = 0x28:0xffffffff82a79be0
> > > > frame pointer = 0x28:0xffffffff82a79c10
> > > > code segment = base Ox0, limit Oxfffff, type Ox1b
> > > > = DPL 0, pres 1, long 1, def32 0, gran
> > > > 1 processor eflags = resume, IOPL = 0
> > > > current process = 0 ()
> > > > [ thread pid 0 tid 0 ]
> > > > Stopped at native_start_all_aps+0x08f: movq
> > > > %rax,(%rsi)
> > > Look up the source line number for this address.
> > >
> >
> > I guess that's sys/amd64/amd64/support.S line 854 (in rdmsr),
> > called by native_start_all_aps. Any additional hints how I can
> > track it down?
> Why did you decided that this is rdmsr_safe() ? First,
> native_start_all_aps() does not call rdmsr, second the ddb
> report clearly indicates that the fault occured acessing DMAP in
> native_start_all_aps().
>
> Just look up the source line by the address
> native_start_all_aps+0x08f.
Okay, according to kgbd this should be here:
https://svnweb.freebsd.org/base/head/sys/amd64/amd64/mp_machdep.c?revision=333368&view=markup#l369
364
365 /* Create the initial 1GB replicated page tables */
366 for (i = 0; i < 512; i++) {
367 /* Each slot of the level 4 pages points to the same
level 3 page */ 368 pt4[i] =
(u_int64_t)(uintptr_t)(mptramp_pagetables + PAGE_SIZE); 369
pt4[i] |= PG_V | PG_RW | PG_U; 370
371 /* Each slot of the level 3 pages points to the same
level 2 page */ 372 pt3[i] =
(u_int64_t)(uintptr_t)(mptramp_pagetables + (2 * PAGE_SIZE));
373 pt3[i] |= PG_V | PG_RW | PG_U; 374
375 /* The level 2 page slots are mapped with 2MB pages for
1GB. */ 376 pt2[i] = i * (2 * 1024 * 1024);
377 pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
378 }
-m
p.s. This machine uses quirks in biosmem.c, see
Type '?' for a list of command, 'help' for more detailed
help.
OK biosmem
bios_basemem: 0x9e400
bios_extmem: 0x3ff00000
memtop: 0x3c000000
high_heap_base: 0x3c000000
high_heap_size: 0x4000000
bios_quirks: 0x01 BQ_DISTRUST_820_EXTMEM
b_bios_probed: 0x0a B_BASEMEM_12 B_EXTMEM_E801
--
Michael Gmelin
--
Michael Gmelin
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